Rotation in AP Physics C: Mechanics
What unit is used to measure impulse in the International System of Units (SI)?
Kilogram-meter per second squared (kg·m/s²)
Watt-second (W·s)
Joule-second (J·s)
Newton-second (N·s)
Which variable remains constant for a rigid body rotating around a fixed axis without any outside torques applied?
Torque
Momentum
Angular momentum
Angular acceleration
If a rigid body is subjected to a net torque, what original experiment could be proposed to investigate the non-linear relationship between angular displacement and time?
Using a variable resistance in the circuit of an electric motor to change its angular acceleration while recording the resulting motion.
Attaching varying masses at different radii on a rotating disk to observe changes in rotational velocity.
Observing pendulum motion with different lengths of string and bob weights under Earth's gravity.
Dropping objects of different masses from the same height to measure their terminal velocity.
A solid sphere and a hollow sphere with identical masses and radii are released simultaneously down an incline; which sphere reaches the bottom first assuming no slipping occurs?
The solid sphere reaches the bottom first.
The hollow sphere reaches the bottom first due to its larger moment of inertia.
Both spheres reach the bottom at exactly the same time because they have identical masses and radii.
It's impossible to determine which one will reach the bottom first without additional information about their materials.
What physical law states that the total mechanical energy in a system remains constant if only conservative forces act within the system?
Conservation of mechanical energy principle
Second law of thermodynamics
Law of universal gravitation
Newton’s second law for rotation
If a uniform solid disc and a hoop are released from the top of an inclined plane at the same time, which will reach the bottom first, assuming no slipping occurs?
Both reach at the same time.
The uniform solid disc.
The hoop.
It cannot be determined with the given information.
If a net torque is applied to an object, what will it experience?
A constant angular velocity regardless of frictional forces present.
A decrease in angular velocity only if it was initially rotating fast.
No change since objects resist changes in their state of rotation due to inertia alone without considering torque effects.
An angular acceleration.

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What does net torque applied on a rigid body cause?
Constant angular velocity
Angular acceleration
Linear acceleration
Conservation of energy
What is the linear momentum of an object directly proportional to?
Its acceleration and velocity
Its mass and velocity
Its mass and acceleration
The net force acting on it
Which quantity measures how much an object resists change in its rotational speed?
Rotational kinetic energy
Moment of inertia
Angular velocity
Centripetal acceleration